chainsaw is a stihl 026av super. has been properly maintained and has run well for 23 yrs. it has fresh fuel and would run for 1/2 hr with no problem. then it would stall and only run with choke on. with choke off it wont start. any ideas?

joe, February 2007

blockage in high speed circuit of carb caused by debris in fuel
tank.remove carb and carefully dismantle and blow through all galleries with wd40.
you may get away with removing high speed screw only and
blow
ing through with wd40, but this doesnt always work.
when re assembling dont mix up low and high speed screws
and lightly do them up then unscrew each by about 3/4 of a
turn anticlockwise. final setting must be done when saw is
at full operating temp.

pumpkin man, March 2007